Hide message on bouncer only if face auth actually runs

Other changes:
 - Also change NotificationPanelViewController to use the same API.

Bug: 20164843
Fixes: 249475000
Test: atest NotificationPanelViewControllerTest
Test: atest KeyguardSecurityContainerControllerTest
Test: atest KeyguardUpdateMonitorTest

Change-Id: I90cc46f8bba03b9d34f96cf6b902180ac5e8f8be
6 files changed